动词短语
中文翻译：活塞敲击
同义词：
['spark plug knock', 'piston knock', 'cylinder knock']
例句：
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1. The enginewas making a loud piston knock as it started up.
发动机启动时发出了响亮的活塞敲击声。
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2. The mechanic had to replace the piston knock due to a worn-out spark plug.
由于火花塞磨损，机械师不得不更换活塞敲击。
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3.The car's engine was sounding off with a piston knock every time it revved up.
每次汽车加速时都会发出活塞敲击声。